Widespread Microsoft outage takes down Outlook and other 365 services

Microsoft suffered a widespread outage on Thursday and Friday, as engineers scrambled to fix server issues that caused disruption to millions of its customers around the world.

Connectivity issues began shortly before 1 p.m. ET on Thursday and continued into Friday, with Outlook and Teams, along with multiple Microsoft 365 services such as Sharepoint and Copilot, affected. Numerous external services that connect with Microsoft products such as Outlook Calendar were also hit.

Microsoft said it was not aware of any malicious activity causing the outage, which it initially blamed on a traffic surge in part of its infrastructure and issues with a component responsible for processing server health.

Email and related tools were unavailable for Microsoft users through the Asian business day and into the European morning.

In an update at around 9:15 a.m. in London (4:15 a.m. ET), Microsoft said users may still be unable to connect to multiple Microsoft 365 products — including Outlook on either web or desktop and any services that interact with email — and did not give a timeline for restoring full service. Most access to Teams was available.

„We are seeing early signs of stabilization, but service capacity has not yet returned to normal levels and health remains variable as traffic is carefully reintroduced,” the company said.

Engineering teams are taking affected systems offline for fixes and bringing them back online in stages while looking at additional options, Microsoft said, adding that it was prioritizing efforts to preserve emails delayed during the recovery process. It is extending the timeout window, whereby delayed emails continue to attempt delivery, for up to 48 hours to help protect messages.

Microsoft said in its initial updates on Thursday that the connectivity problems related to infrastructure „elevated load across multiple regions,” caused by a „number of servers being unexpectedly unavailable; straining the remaining infrastructure.” Some servers were failing automated health checks, it said.

Microsoft shares were 2.6% lower in premarket trade.

Governments and businesses in Asia-Pacific and Europe said they were monitoring the situation, which was causing widespread disruption.

Earnings for Swiss luxury goods giant Richemont were slightly delayed on Friday due to the outage. Electric truck maker Workhorse Group, which was expected to report third-quarter results on Nov. 12, rescheduled the release to Nov. 16, citing business disruptions caused by the global Microsoft outage.

Air India said it had „temporarily rerouted” emails so it could continue to receive customer messages, adding that its flight operations were not affected.

Australian Home Affairs and Cyber Security Minister Tony Burke said in a press conference that Microsoft „believe they are dealing in some ways similar to what we saw with respect to CrowdStrike where there is an update that has gone awry,” Reuters reported.

A fault with an update issued by cybersecurity company CrowdStrike caused one of the world’s biggest IT system outages in 2024, hitting airlines, banks and more,

Microsoft reported in 2025 that Copilot, its collection of AI assistants and tools, had more than 100 million monthly active users.

Amazon Web Services and Google users also reported outages on the site on Thursday.

Amazon wrote on X that services were „operating normally” and an „unrelated disruption elsewhere on the internet is prompting some inaccurate news reports.” The company referred users to its health dashboard for „accurate data.”

At 4 p.m. ET Thursday, Microsoft said it had „validated an alternative service health check method” that brought some affected servers back online.

„We’re now applying this change more broadly,” Microsoft wrote. „We’re also preparing automated recovery systems to continually detect and restart unresponsive servers, to maintain service stability while this change progresses.”